Design The Network - Inter-Tel AXXESS Manual

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What is the numbering plan for the extensions, Voice Processing applications, feature
codes, hunt groups, node trunk groups, etc? Remember to leave room for expansion in
your numbering plan.
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Does each node have a local trunk group for emergency calls?
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Which system in the network will have the Voice Processing Unit?
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How will calls ring in to the Voice Processing Unit? Will they be routed to other nodes?
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Will call routing tables and/or ARS route calls to other nodes?
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Which station(s) will be the network-wide primary attendant(s)? Which stations are the
node attendants?
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Will SMDR include all network calls? Where will the output port(s) be located?
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Where will the message print port(s) be located?
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Where will fax machines, modems, and external paging ports be located?
B. DESIGN THE NETWORK
2.3
For optimum network operation, follow these guidelines:
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Carefully manage the traffic on a central node. The central node is susceptible to
unintentional bottlenecks. Good rules of thumb for preventing bottlenecks on the cen-
tral node are:
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Limit the maximum number of display phones to 355 per node. Redistribute the
load; adding another node if necessary. Or, use the CP Server on the node or upgrade to
an ATM system.

Design the Network

®
INTER-TEL AXXESS
If the node contains a Voice Processing Unit voice mail system with more than 16
ports and more than 128 Executive Display, Professional Display, or Model 8560
Phones, redistribute the load by moving some of the Executive Display, Profes-
sional Display, or Model 8560 Phones to another node, creating a new node, if
necessary. Or, use the CP Server on the node.
If networked node with a Voice Processing Unit with Automated Attendant and/or
Call Routing Applications is expected to handle more than 1000 calls in an hour,
use a separate Voice Processing Unit to provide the announcements. Or, use the
CP Server on the node.
If a node with a centralized voice mail supports more than four nodes or a total of
1500 off-node devices, redistribute the load by reducing the number of stations on
the central node to 200 (adding another node, if necessary). Or, use the CP Server
on the node.
A node used as an outgoing call center should not have more than 100 agents.
Redistribute the load among several nodes, if possible, or place the call center on
its own node. Or, use the CP Server on the node.
A node should not have more than five ISDN Primary Rate trunks for private net-
working or to the central office. Redistribute the load by moving ISDN trunks to
another node, adding a node, if necessary. Or, use the CP Server on the node.
For very busy systems or large networks, equip the satellite nodes with their own
local and long distance trunks where possible.
If the central node is used for all long distance calls, make sure it is equipped with
enough trunks to handle the peak traffic.
Appendix A — Networking
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MANUAL VERSION 11.0 – May 2008
Page A-5